An update on my previous post, it turns out my ISP does support PPPoE, which is great. I successfully connected both modems to the load balancer, BUT I still get random DNS request timeout errors!!

The DNS timeout problem is definitely in the load balancer. Using Wireshark I see DNS ICMP packets coming back from the load balancer saying: Destination Port unreachable

If I change my desktop to static IP settings with DNS = 8.8.8.8 everything works fine. Firmware bug??

Load Balancer: TL-R470T+ Version 6.0.4 Build 20200313 Rel.32850

 

Perhaps I should post this problem in a different forum?

I did put the DNS values the modem gets from my ISP in the optional fields, but now specifying 8.8.8.8 and 8.8.4.4 in the Optional fields, things are looking good. thanks for your help

Unfortunately I'm still getting DNS Destination Port unreachable errors, no matter what I put in the Optional fields. I will post this problem on the business forums. 

 

Getting back to the VR400, I notice when its in Bridge Mode and connected to the load balancer I can no longer get to the admin page by entering its local LAN address. In Wireshark I can see the ARP request go out to find the VR400 mac address but its on the WAN side of the load balancer so no reply is sent back. However, I can get to the VR400 login page if I enter the public address assigned to the modem but I just get Login Failed even though I enabled external access. This may be because the connection is still coming from the LAN side of the mode. 

 

Any tips would be greatly appreciated. 

 

 

  @terziyski thanks for those suggestions.

Adding a static route lets me get to the modem ok now.